[MacPorts] #64202: Build fails on 10.5.8 PowerPC

[MacPorts]

#64202: Build fails on 10.5.8 PowerPC
-----------------------------------+------------------------------
  Reporter:  barracuda156          |      Owner:  (none)
      Type:  defect                |     Status:  new
  Priority:  Normal                |  Milestone:
 Component:  ports                 |    Version:  2.7.1
Resolution:                        |   Keywords:  PowerPC, Leopard
      Port:  libtorrent-rasterbar  |
-----------------------------------+------------------------------

Comment (by kencu):

 libdispatch is missing on < 10.6. {{{dispatch_queue_t}}} and others come
 from there.

 It is apparently not too difficult to add it as a separate project:

 <https://github.com/nickhutchinson/libdispatch>

 <https://github.com/apple/swift-corelibs-libdispatch>

 So it is likely possible to at least try to bring it in for older systems,
 if the kernel support it may need is present.

 Sometimes projects will have another method of concurrency that might be
 used instead -- if so, you can sometimes find a way to force the project
 to build without using libdispatch, but using some linux method if there
 is one.

-- 
Ticket URL: <https://trac.macports.org/ticket/64202#comment:1>
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